split into different Strings based on regex in java

Question

I have requirement to split a string based on Regular expression which will be of the below format.

There are 3 different type of String values -

ABC_1234_XL.jpg
XYZ_7890_SM.jpg
PQ_R_4567_LG.jpg

The regex that I have right now which isn't working is -

(^[a-zA-Z])(_\\d+_)([a-zA-Z]$)

in the above ABC, XYZ and PQ_R are 3 types of image types which I want to extract separately and compare it with respective list of corresponding Types fetched from DB. So in case if I go with normal split by underscore "_", then it flunks the purpose while splitting the 3rd string.

So I need a solution to split these string based on Regular expression, where every time the center element will [0-9] and the left would be Image Type and the right would be Image Size.
Meaning - ImageType_ImageTypeID_ImageSize. We need to split this having the center element (imageTypeID) as base and get the left & right date by excluding the "_". How to achieve this with Split along with Regex?

Help please and let me know in case if you need more info.

Pshemo · Accepted Answer · 2014-06-06 21:16:22Z

2

OK since no one yet explained your problem then I will try. Your current regex

(^[a-zA-Z])(_\\d+_)([a-zA-Z]$)

can match only strings with one letter at start, _, one or more digits, another _ and ends with one letter. What you need is regex which accept strings that

[a-zA-Z]+(?:_[a-zA-Z]+)* - starts with one or more letters and can have optional sequences of _ and letters (not digits yet)
_\\d+_ - have digits surrounded with _ after it
[a-zA-Z]+ have one or more letters after it.
You probably also want to end your regex with sequence which will match file extension, so you will need something like [.]jpg

So try with

([a-z]+(?:_[a-z]+)*)_(\\d+)_([a-z]+)[.]jpg

Demo:

String[] data = {
        "ABC_1234_XL.jpg",
        "XYZ_7890_SM.jpg",
        "PQ_R_4567_LG.jpg",
};
Pattern p = Pattern.compile(
            "([a-z]+(?:_[a-z]+)*)_(\\d+)_([a-z]+)[.]jpg",
   //group 1  ^^^^^^^^^^^^^^^^^^
   //group 2                       ^^^^
   //group 3                              ^^^^^^
            Pattern.CASE_INSENSITIVE);
for (String s : data) {
    Matcher m = p.matcher(s);
    if (m.matches())
        System.out.println(m.group(1)+" : "+m.group(2)+" : "+m.group(3));
    else
        System.out.println(s+" doesn't match pattern");
}

Output:

ABC : 1234 : XL
XYZ : 7890 : SM
PQ_R : 4567 : LG

edited Jun 6, 2014 at 21:16

answered Jun 6, 2014 at 21:07

Pshemo

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3 Comments

Gersh Over a year ago

Let me try this and get back. Thank You Pshemo. :)

Pshemo Over a year ago

I am glad you like it :)

Gersh Over a year ago

Yes. This works and as same as exactly what I wanted. Now I can use these string values for different business logic. Thanks once again mate, :)

Mayank Agarwal · Accepted Answer · 2014-06-06 20:53:00Z

0

Try this:

([a-zA-Z][_][a-zA-Z]*)(\d+)([\w]+[.][\w]+)

The first group looks for as many characters or _ as it can get Second group finds the 123123 pattern And the last one gets you the size and its type.

answered Jun 6, 2014 at 20:53

Mayank Agarwal

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Comments

Serge Ballesta · Accepted Answer · 2014-06-06 20:55:32Z

0

If the first part is allowed to contain a _, I think it is enough to include it in the list of characters of this block :

(^[a-zA-Z_]+)(_\\d+_)([a-zA-Z]+)

You can even put the delimiters outside of your center block :

(^[a-zA-Z_]+)_(\\d+)_([a-zA-Z]+)

answered Jun 6, 2014 at 20:55

Serge Ballesta

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2 Comments

Gersh Over a year ago

thanks. If I put delimiter outside the center block then --> PQ_R_4567_LG.jpg would have problem - when I try to split the string into 3 parts.

Gersh Over a year ago

Also, ur first regex works good. But I want to know how to split based on this pattern and assign the 3 parts to 3 different Strings.

jupenur · Accepted Answer · 2014-06-06 20:47:48Z

-1

^([A-Za-z_]+)_(\\d+)_([A-Za-z]+)\\.jpg$

answered Jun 6, 2014 at 20:47

jupenur

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3 Comments

Pshemo Over a year ago

While it is good to provide solution it is even better to explain how it solves problem.

Gersh Over a year ago

thanks. Regex is fine but need a logic to split this into 3 different strings.

Gersh Over a year ago

Pshemo - Thanks for the echo

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